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3 Sheets-Sheet 1A D. L. OSBORN. AERIAL LADDER EUR EIREMEN ADD OTHERS.

Patented Feb. 17,1891.

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D. L. OSBORN. Y AERIAL LADDEE` EOE EIEEMEN AND OTHERS. No. 446,560.` Patented Feb. 17, 18911.

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D. L. OSBORN. AERIAL LADDER PUB. FIREMEN AND OTHER No, 446,560. Patented Peb. 17,1891.

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DAVID L. OSBORIT, OF KANSAS CITY, MISSOURI, ASSIGIOR OF 'l`\VO-'IIIIRDS TO DAVID G. BLAIR AND EMERSON S. NORTIII'I, BOTII OF SAME PLACE.

AERIAL. LADDER FOR FlREii/EN ND OTHERS.

SPECIFLCATION forming part of Letters Patent No. 446,560, dated February 17, 1891. Application filed September 19, 189D. Serial No. 365,479. (No model.)

To all whom, it may concern.-

Be it known that I, DAVID L. OSBORN, of Kansas City, Jackson county, Missouri, have invented certain new and useful Improvements in Aerial Ladders for Firemen and other Purposes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to improvements in aerial ladders, and may be used for derrick, water-tower, and other purposes; and it consists in the peculiar combination and arrangement of devices hereinafter specified and claimed.

My object is to provide an aerial ladder supported upon a suitable truck of ordinary size, which may be run into Yan alley or other narrow space, and thus in case of iire or panic, when the occupants of a building are unable to reach the front windows or doors, may be utilized in places inaccessible to the aerial ladder of ordinary construction, and may be used for derrick and other purposes.

Referring to the drawings accompanying` the description, Figure l is a side elevation of the ladder mounted upon a truck in its normal or folded position. Fig. 2 is a central vertical longitudinal section of the saine with truck removed. Fig. 3 is a plan view of the invention. Fig. at is a perspective view of the ladder in its elevated position. Fig. 5 is a sectional view on a line x a: of Fig. t broken away. Fig. G is a detail perspective view of a chair supported at the upper end of the ladder.

Similar letters refer to similar parts in all the figures, in which A represents a truck of ordinary construetion, on which is supported the body or supporting-frame B, consisting of the side bars O C and end bars D D of aerial ladder E.

The end bars D D are provided with the downwardly-extending ears F F, in which is journaled the worin-bar G, having a small geai\vlieel II keyed on the rear end thereof, which is engaged by the cog-wheel l, keyed on the short shaft J, having one end journaled in the rear cross-bar D of the frame B, and secured on the opposite rear end is the handwheel L.

The ladder E, comprising the outer and inner sides or frames M and N, constructed on the lazy-tongs principle and connected by the holders or steps O, is supported between the framework B, the lower forward end of the iirst pair of levers having its holder or crossbar O permanently secured between the side bars O, and the rear pair of the levers having the extended curved ends I). The holder or 6o cross -bar of this pair of levers projects through the said levers and enters and is adapted to travel or slide in horizontal grooves Q in the inner side of the side bars O O, in alignment with the pins of the permanent holder or cross-bar O.

The curved arms P are provided with the slots R, which engage and travel on the cylindrical ends ,of cross bar S, said cylindrical ends being screw-threaded and engaged by 7o securing-nuts T.

The cross-bar S is enlarged at its middle and provided with the screw-threaded perforation U, surrounding andengaging the thread of worm-bar G. Secured on the upper pairs offrames is the frame-work or chair V, composing the horizontal platform IV, resting and secured upon the upper edges of the forwardly and rearwardly extending side bars X, near the forward end of which are pivoted 8o the forward arms of the upper levers or frames, side bars X being also provided with the extended slots Yin horizontal alignment with the pivoted forward arms, in which are intended to slide or travel thecross-bar Z of the rear arms of the saidlevers when the ladder is elevated or lowered.

The platform XV, forming the base of the chair V, is provided with the opening A', in which is hinged the trap-doorB. Supported 9o at the -upper ends of vertical standard C', bolted to the upper surface of the platform, is the railing D', the forward open end of which is adapted to be closed by the pivotal latch-bar E. The frames consisting of the inner lever may be provided with any suitable number of steps or rounds F, as illustrated.

My invention in this case is operated by a hand-wheel wormscrew, but maybe operated roo equally as well by a lever, cable, or a cam,

tbc.; but the operation of the invention in this arrangement is as follows: The handwheel L being operated causes the operation through the meshing gear-wheels I and II of the worm-har G, which, operating in the screwthreaded perforation of the cross-hars conmeeting` the lower curved ends I) of the rear arms of the levers, causes the said arms to advance or move toward the forward or permanently-pivoted arms. The impulse coznmunicated to the lower pair of levers causes the simultaneous closing and vertical extension of the ladder, as will he readily understood. The trap-door in the platform NV allows the person ascending to enter the ehairwithout any difficulty. When desiring to lower the ladder, the operation of the hand-wheel in the reverse direction causes the ladder to descend and fold, as will be readily understood. V'Vhen lowered, the catch-har is opened and the passenger dismounts.

Ha ving,` thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, with a frame-work, of a worm-har supported therein, a cross-bar mounted upon the said worm-bar, a pair of levers having their forward ends pivoted in the said frame-work and extending rearwardly therefrom, and a pair of levers pivoted to the said rearwardly-extending levers and having` their rear end slotted and sliding` upon the said cross-har, as described.

2. The combination7 with a slotted framework, of a worm-bar supported therein, a cross-har mounted upon the said worin-bar and having` rounded ends, a pair of levers having their forward ends pivoted in the said frame-work and extending rearwardly therefrom, and a pair of levers pivoted to the said rearwardly extending' levers and having slotted curved rear ends, the slots therein sliding,` upon the rounded ends of the said cross-bar, and projections from the sides of the said rearwardly-extending curved levers sliding in the slots in the said frame, as described.

In testimony whereof I aiiix my signature in presence of two witnesses.

DAVID L. OSBORN.

XVitnesses:

GEO. G. THoRPn, H. E. PRICE. 

